46 DorsEY: VARIATION IN FLORAL STRUCTURES OF ViITIs 
in the stamen number has, in general, a definite direction in the 
flowers of each vine. In most cases the mode falls on five, but 
in some of the cultivated varieties, as in Jaeger No. 43 and Seibel 
No. 2, the mode is distinctly on six; while in Janesville there are 
only a few flowers having five stamens, with the number having 
six and seven practically equal, more having eight stamens than 
five, and three flowers having nine. This is a striking variation 
from the usual number five. Among those included in this table 
there were no flowers observed having double the number of 
stamens, the nearest approach to this being nine. 
The summary of TABLE I, giving the total number of flowers 
for each stamen number, shows considerable variation in the 
number of stamens per flower in Vitis. The stamen number is 
variable in all the clusters included, whether of a species, variety, 
or cross. Out of a total of 30,721 grape flowers in which the 
stamens were counted, there are more (21,385) having five stamens 
than any other number; more (5,829) having six stamens than 
four, which is represented by 2,630 flowers; 783 have seven sta- 
mens and 82 have eight; while the two extremes are represented 
by much smaller numbers, 6 having nine stamens and 6 also three. 
The trend of the variation, therefore, is toward an increase in the 
number of stamens rather than a decrease. 
VARIATION IN COROLLA NUMBER: The number of parts to the 
cap is usually the same as the number of stamens (PLATE I, FIG. 3 
and 5). Exceptions to this occur where two small stamens are 
found opposite one petal, or where two filaments are united more 
or less throughout their entire length; but this occurs so seldom, 
and the relation between the petal and the stamen number is so 
close, that TABLE I may be regarded as showing fairly accurately 
the variation in the number of petals in the cap as well as the 
stamen number. 
VARIATIONS IN THE NECTARIFEROUS GLANDS: The nectariferous 
glands vary much in color and size; they also correspond very 
closely in number with the stamens and petals. On some vines 
they are pale yellow while in other cases they are a dark yellow 
or yellowish green. On some of the cultivated varieties, as 
Concord and Worden of the blue varieties, and Diamond, Leader, 
or Pocklington of the green, they still persist in the mature berry 
